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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [line items]      
Cash $ 44 $ 61  
Investments in corporate bonds 475 400  
Investments in government bonds 457 540  
Total fixed-income securities 976 1,001  
Investment in marketable securities 430 380  
Other investments and private funds 288 219  
Total variable-income securities 718 599  
Total plan assets 1,694 1,600 $ 1,487
Level 1 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 44 45  
Investments in corporate bonds 1 4  
Investments in government bonds 86 90  
Total fixed-income securities 131 139  
Investment in marketable securities 341 223  
Other investments and private funds 146 46  
Total variable-income securities 487 269  
Total plan assets 618 408  
Level 2 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 0 16  
Investments in corporate bonds 474 396  
Investments in government bonds 371 450  
Total fixed-income securities 845 862  
Investment in marketable securities 89 157  
Other investments and private funds 55 85  
Total variable-income securities 144 242  
Total plan assets 989 1,104  
Level 3 [Member]      
Disclosure of fair value of plan assets [line items]      
Other investments and private funds 87 88  
Total variable-income securities 87 88  
Total plan assets $ 87 $ 88